Transmigrated as an Omega who snags his Alpha

Quinton Lewis was once a top-dog gangster in his past life. He dies after a fatal gunshot and wakes up to find himself in a unfamiliar room, wearing provocative lingerie, with a man undressing beside him. After fighting back the stranger, he realizes he’s been transmigrated into an ABO world as a pampered omega lover, and the man beside him is his Alpha… but who exactly is this person now claiming him?